Coupling and method for fixing the same

Abstract

A coupling including a body member including a fitting hole into which an end of a spline shaft is fitted, and a connecting portion, the shaft including spline grooves linearly extending in an axial direction in a circumferential direction; a positioning mechanism positioning the body member in the circumferential direction with respect to the shaft fitted into the fitting hole; and a fixing portion fixing, to the shaft, the body member being positioned. The positioning mechanism includes a screw hole provided in the body member so as to penetrate from an outer surface of the body member to an inner surface of the fitting hole, a screw member fastened into the screw hole, and a pressing part having a circular cross section, provided in a tip of the screw member, and pressed against the spline groove by fastening of the screw member into the screw hole.

The invention claimed is: 
     
       1. A method for fixing a coupling comprising the steps of:
 fitting an end of a spline shaft including a plurality of spline grooves into a fitting hole of a body member, the plurality of spline grooves linearly extending in an axial direction at an interval in a circumferential direction; 
 pressing a pressing part having a circular cross section, provided in a tip of a screw member, against the spline groove by fastening the screw member into a screw hole provided in the body member so as to penetrate from an outer surface of the body member to an inner surface of the fitting hole along a radial direction, and positioning the body member in the circumferential direction of the spline shaft; and 
 fixing the body member in a state of being positioned to the spline shaft.